Thanks for your help - this works and I get > s <- 2 > c <- 3 > a <- 2 > P <- 1 > attributes(eval(df1p))$gradient[,'P'] P -2
What I really wanted was an expression that I can use later - do you think there's any way to do this? -- View this message in context: http://n4.nabble.com/Extracting-formulae-from-expression-deriv-tp1752738p1752856.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
